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update: PLT hooks unload

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This commit changes how PLT hooks are unloaded, so that we're able to bypass detections caused by page faulting libandroid_runtime.so.
This commit is contained in:
ThePedroo
2025-06-01 23:21:43 -03:00
parent 2f589d0eda
commit c975722795
1 changed files with 18 additions and 16 deletions
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34
loader/src/injector/hook.cpp
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@@ -31,7 +31,6 @@
using namespace std; using namespace std;
static void hook_unloader(); static void hook_unloader();
static void unhook_functions();
namespace { namespace {
@@ -220,8 +219,14 @@ DCL_HOOK_FUNC(int, pthread_attr_setstacksize, void *target, size_t size) {
if (gettid() != getpid()) if (gettid() != getpid())
return res; return res;
delete plt_hook_list;
if (should_unmap_zygisk) { if (should_unmap_zygisk) {
unhook_functions(); if (!lsplt::InvalidateBackup()) {
LOGE("Failed to invalidate backup for plt_hook");
should_unmap_zygisk = false;
}
cached_map_infos.clear(); cached_map_infos.clear();
if (should_unmap_zygisk) { if (should_unmap_zygisk) {
@@ -232,6 +237,17 @@ DCL_HOOK_FUNC(int, pthread_attr_setstacksize, void *target, size_t size) {
[[clang::musttail]] return munmap(start_addr, block_size); [[clang::musttail]] return munmap(start_addr, block_size);
} }
} else {
for (const auto &[dev, inode, sym, old_func] : *plt_hook_list) {
if (!lsplt::RegisterHook(dev, inode, sym, *old_func, nullptr)) {
LOGE("Failed to register plt_hook [%s]", sym);
}
}
if (!lsplt::CommitHook(cached_map_infos)) {
LOGE("Failed to restore plt_hook");
should_unmap_zygisk = false;
}
} }
return res; return res;
@@ -950,17 +966,3 @@ static void hook_unloader() {
PLT_HOOK_REGISTER(art_dev, art_inode, pthread_attr_setstacksize); PLT_HOOK_REGISTER(art_dev, art_inode, pthread_attr_setstacksize);
hook_commit(); hook_commit();
} }
static void unhook_functions() {
// Unhook plt_hook
for (const auto &[dev, inode, sym, old_func] : *plt_hook_list) {
if (!lsplt::RegisterHook(dev, inode, sym, *old_func, nullptr)) {
LOGE("Failed to register plt_hook [%s]", sym);
}
}
delete plt_hook_list;
if (!hook_commit()) {
LOGE("Failed to restore plt_hook");
should_unmap_zygisk = false;
}
}